Lmp and ultrasound dates don't match. Has that happened to anyone else here? Some women with regular cycles are confused about why their ultrasound due date doesn’t match up with their last menstrual period due date. Lmp and ultrasound dates don't match

Implantation bleeding 3. Heart rate was 106, consistent with this gestational age. So I went for my first ultrasound at 7 weeks 2 days. Doctors will usually keep the original due. Got my bfp on 28 th of July Today I had. The dr said that he is not worried, but that I need to come back in two weeks for another ultrasound to confirm dates. Irregular periods 2. The later the ultrasound is performed, the less accurate the dating. Due date is based on LMP unless us off by more than 1 week 1st trimester or 2 weeks in 2nd. The accuracy of ultrasound measurements used to confirm the calculated due date will be much less accurate further into the pregnancy. Ultrasound date doesn't match LMP date Momsiez2016 19/11/15 Hi ladies, So, when I went for my initial checkup the doctor said I am 6 weeks 2 days into pregnancy (based on the first day of my last period). My LMP was June 6th which should make me almost 9 weeks. Within about 4–5 days of where you think you are is. Ovulation isn’t a perfect science and can happen earlier or later than the norm, which might shift your due date slightly. ACOG recommends redating as follows: First trimester: based on CRL measurement. Amy Levine answered Radiology 25 years experience Ultrasound dating: It depends on the timing of ultrasound. Fetal growth rate 4. Pediatrics 35 years experience. I was keeping track of my cycle on an app, so I know for sure the date of my last period. Posted 11/13/12 Hello, I had a question about my first ultrasound today. June 2015. 14w0d – 15w6d: redate if discrepancy is > 7d. ACOG recommends redating as follows: First trimester: based on CRL measurement 8w6d or less: redate if discrepancy is > 5d 9w0d – 13w6d: redate if discrepancy is > 7d Second trimester: based on BPD, HC,. The ultrasound…1 thank Dr. Second trimester: based on BPD, HC, AC and FL. Known LMP is the most accurate in determining an estimated date of delivery (EDD). Due Date Discrepancy Between LMP and Ultrasound Gestational Age: Expert Insights Understanding LMP and ultrasound gestational age Causes of discrepancy between LMP and ultrasound gestational age 1. 2 weeks away from what was expected, there is a good chance that everything is still fine. That’s okay…a few days or even a week of discrepancy won’t change your dates. in my previous pregnancies, something similar has happened as well. Lmp dating also assumes a 28 day cycle. Bubs had a heart beat at the ultrasound. A first trimester ultrasound is accurate within 7 days of that. based on my LMP, my due date would be 11/30. Amy Levine answered Radiology 25 years experience Ultrasound dating: It depends on the timing of ultrasound. Created for people with ongoing healthcare needs but benefits everyone. You may have simply conceived earlier or later than you thought you did (which can happen if your cycle is at all irregular or if you remembered your last menstrual. There is no test that can date conception more accurately than a 1 week window. Ultrasound dates don't match my lmp and I'm confused : Hi there, my lmp was June 30 th 2013 which would make me 8 weeks and 2 days. Lmp dating also assumes a 28 day cycle. When Due Dates Don't Match If an early ultrasound gives you a due date that is more than 1. Read More. 2 weeks. There will be times that dating based on LMP does not match the ultrasound date. “If the scan date differs from your LMP dates, then the scan dates will be used, but do discuss with your midwife if you are concerned. Ultrasound timing There will be times that dating based on LMP does not match the ultrasound date. LMP would make the due date Jan 25 but since the baby was longer than it should have been at 6 weeks, the baby measured 7 weeks instead of 6 weeks, so the due date as moved to Jan 18 based of the crown to rump length in the ultrasound. As soon as data from the last menstrual period (LMP), the first accurate ultrasound examination, or both are obtained, the gestational age and the EDD should be determined, discussed with the patient, and documented clearly in the medical record. I was keeping track of my cycle on an app, so I know for sure the date of my last period. But according to my ultra sound (3 days later) I was only 4 weeks and 5 days into pregnancy. The ultrasound… An early obstetric ultrasound performed at approximately 8 weeks where a crown rump length (the CRL) is measured precisely predicts an estimated due date accurately. I went in on the 23rd of July for my first ultrasound. Apr 9, 2016 at 8:16 AM. LMP and Due Date don't match up. I h… A 2021 study ran an assessment to ascertain the efficacy of LMP versus ultrasound to predict the delivery date. It is less accurate if your period is not regular, in which case early ultrasound dating can be more reliable. The best time to establish. The first ultrasound appointment determined baby is due in March. The baby had a yolk sac and a heart beat. This is especially true if you have an irregular cycle or have been on the Pill for example. Ultrasound dates don't match my lmp and I'm confused : Hi there, my lmp was June 30 th 2013 which would make me 8 weeks and 2 days. According to my LMP I should be 7 weeks and 3 days, but according to the ultrasound I am 5 weeks and six days. 8w6d or less: redate if discrepancy is > 5d. I should have been 6 weeks 5 days,. Has that happened to anyone else here? Some women with regular cycles are confused about why their ultrasound due date doesn’t match up with their last menstrual period due date. . So I have to come back next week. . However, if the LMP due date is more accurate, the healthcare provider may. Why are my ultrasound measurments not matching up to my LMP? - Quora Answer (1 of 3): There’s a few explanations. the baby measured a week behind so the PA at my OBs office said i ovulated late and changed it to 12/7, then OB changed it to 12/9 a few mins later. First trimester ultrasound is accurate within 5-7 days. Robert Kwok answered. This is because the ultrasound due date is based on the size of the baby, which is a more accurate way to determine the due date. 2nd trimester ultrasound has accuracy of +/_ 2 weeks. Sonographer said they ussuall go with period dates unless if the dates difference not greater then 5 days,if it is they go with ultrasound dates Try the MFM due date calculator. I didn’t find out I was pregnant till July. But I notice the majority here in this group, LMP was in June. I was off by ten days so the doctor said they go with the ultrasound. Lmp date and ultrasound date dont match! My last menstrual period was on the 25/11/2014 and the doctor guessed my due date was the 1 sept making me 7+4. However if the baby is measuring smaller or larger than 7 days to the EDD we often adjust the EDD to the ultrasound date. So I went for my first ultrasound at 7 weeks 2 days. Probably ovulation hapoehap later or something like that. Dr. 34 days. Yeah I went on ultrasound recently was sure already about 7 week. But this will only give you a rough idea. going by your LMP is actually very inaccurate. At that time. alot of women ovulate later than they expected and the dr does his guess based on a 28 day cycle but doesnt apply to some women because some have a longer cycle ex. Therefore, it is correct to say that the ultrasound due date is more accurate. That is standard practice and works out for most babies. 9w0d – 13w6d: redate if discrepancy is > 7d. Pregnancy normally lasts from 37 weeks to 42 weeks from the first day of your last period, explains NHS Choices. “Scans are an accurate way to give you a due date,” confirms. There is no test that can date conception more accurately than a 1 week window. They observed that subjects whose delivery date was determined via ultrasound were more spot-on than candidates whose EDD was based on LMP. 1. . See moreDue dates predicted with early ultrasound have a margin of error of roughly 1. Ultrasound and LMP dates don't match j jmavin Dec 12, 2015 at 6:20 AM Hi everyone - I had an ultrasound yesterday where I measured 6 weeks 3 days. Got my bfp on 28 th of July Today I had an ultrasound and they said I am only 7 weeks and 4 days. In other words, if the ultrasound was measured accurately, then you know for a fact that you ovulated late and you should go with the ultrasound age, not the. 2 weeks after LMP: Because the ultrasound dating estimate presumes 28-day cycles and ovulation at mid-cycle, when the LMP matches the ultrasound dating estimate, one can. it is confusing but your dating u/s is going to be the more accurate answer r my doc changed my due date after my ultrasound. @Elysela, I don't think it means a doctor is "stupid" because he/she calculates your due date as 40 weeks from LMP. mine always seems to go by the baby. Is this normal? 1 thank Dr. But ultrasound says only around 5 weeks. Not sure which date to go by? - BabyCenter Canada It is recommended that women go by the ultrasound due date if there is a discrepancy between the LMP and ultrasound gestational age. First trimester ultrasound is accurate within 5-7 days. W WhityIty Feb 27, 2023 at 4:31 PM My LMP was May 15, 2022. 2nd trimester ultrasound has accuracy of +/_ 2 weeks. I’ve recently found out I was pregnant with baby number 3 But my period dates don’t match my ultrasound dates by 5/6 weeks. My due date is March 22, 2023. brady6231. First trimester ultrasound is.